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首页> 外文期刊>Ethology >Testes Investment along a Vertical Depth Gradient in an Herbivorous Fish
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Testes Investment along a Vertical Depth Gradient in an Herbivorous Fish

机译：食草鱼沿垂直深度梯度的睾丸投资

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摘要

Males are expected to adjust testes investment according to the varying level of sperm competition that they experience. Spatial and temporal variation in population density likely influences sperm competition. In herbivorous aquatic organisms, densities often decrease along a vertical depth gradient, because their food is photosynthetic and thus becomes less abundant in deeper regions where less light penetrates. This decrease should be dramatic on a steep slope, which allows testing of the association between density and testes investment at the within-population level. We tested the effect in the socially monogamous herbivorous cichlid fish Variabilichromis moorii living on a steep slope in Lake Tanganyika. We examined competitor density and food abundance as ecological factors, territory defense behaviors and phenotypic traits (testes investment and somatic investment), and compared them between shallow (46m depth) and deep habitats (1013m depth) separated by several dozen meters. We found that food availability drastically decreased with increasing depth and that V .moorii was much more abundant in shallower habitats. Males in shallower habitats were in better physical condition (based on fat and liver mass) despite experiencing greater costs in terms of territory defense. Testes investment differed in areas with different competitor density and food abundance along a vertical depth gradient, but competitor density was the most explanatory factor of the difference. This suggests that this herbivorous fish would change testes investment in response to population density.
机译：男性应根据他们所经历的精子竞争水平的不同来调整睾丸的投资。人口密度的时空变化可能会影响精子竞争。在草食性水生生物中，密度通常沿垂直深度梯度降低，因为它们的食物是光合作用的，因此在光线穿透较少的较深区域变得较少。这种下降在陡峭的坡度上应该是显着的，这允许在人口内部水平测试密度和睾丸投资之间的关联。我们测试了在坦any尼喀湖陡峭山坡上生活的一夫一妻制丽鱼科鱼类Variabilichromis moorii的效应。我们检查了竞争者的密度和食物丰度作为生态因素，领土防御行为和表型特征（睾丸投资和躯体投资），并在分隔数十米的浅层（46m深度）和深层栖息地（1013m深度）之间进行了比较。我们发现，随着深度的增加，食物的可获得性急剧下降，而在较浅的生境中，V.moorii的丰富得多。尽管在领土防御方面付出了更高的代价，但在较浅的生境中的男性身体状况（基于脂肪和肝脏质量）处于较好状态。在垂直深度梯度上，竞争者密度和食物丰度不同的地区，睾丸的投资有所不同，但是竞争者密度是造成差异的最主要原因。这表明，这种草食性鱼类将根据人口密度改变睾丸的投资。

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